Electric water-heater.



H. A. BURNS. ELECTRIC WATER HEATER. APPLICATION FILED SEPT. s, 1910.

Patented Jan. 10, 1911.

INYENfOR 0 AM1 BY ATTORNEY UNITED STAT1EMETENT OFFICE.

HERBERT A. BURNS, OF- OAKLAND, CALIFORNIA, ASSIGNOR T0 DIAMOND ELECTRICWATER HEATER 00., SAN FRANCISCO, CALIFORNIA.

ELECTRIC WATER-HEATER.

Specification of Letters Patent. Patented J an. 10, 1911.

Application filed September 3. 1910. Serial No. 580,317.

To all whom "it may concern:

Be it known that- I, HERBERT A. BURNS, a citizen of the United States,residing at Oakland, in the county of Alameda and State of California,have invented new and useful Improvements in Electric \Vater-Heaters, ofwhich the following is a specification.

The present invention relates to improvements in electric water heaters,one object of the invention being to provide a device of this kind whichwill be cheap and simple in construction, and effective in use. drawbackheretofore experienced in the use of electric water heaters is that,unless the electric current is turned off before the heater is removedfrom the water, the high resistance wire of the heater is immediatelyburned out.

A furtlier object; of the invention is to reduce the liability of thisoccurrence.

In the accompanying drawing, Figure 1 is a side view of my improvedheater; Fig. 2 is an enlarged sectional vertical view thereof. I

Referring to the drawing, 1 and 2 indicate outer and inner cylindricalshells or casings, which have bottoms 3 and 4 respectively. The innercasing is formed at the top with a flange 5, the outer edge is solderedto the upper edge of the casing. The bottom of the inner casing isformed with a centrally arranged vertical ring or flange 6;, withinwhich is inserted the lower end of atube 7, said low er end being thensoldered to said flange. Down said tube extend covered wires 8 and 9,leading from a lamp socket 10, the lower endsof said wires passing intothe space between the bottoms of the two casings, To said covered wiresare secured the ends of a high resistance wire 11. A circular sheet 12of mica, apertured at the center, is interposed between the bottom 4 ofthe inner casing and said wires 8 and 9 and a sheet 13 is interposedbetween said wires and the bottom 3. From the wire 8, said highresistance wire 11 passes u by the side of the inner casing to the top toreof, as shown at 14, a narrow strip 15 of mica being interposedbetween said wire and of whichby. indrical casings,

inner casing. A sheet 16 of mica is then bent around said inner casing,and over said portion 141'; of the wire, and then said high resistancewire is wound over said cylindrical casinglb in a helical form, as shownat 17, bottom to the terminal of the other conducting wire a. A sheet 18of mica is interposed the other end being connected at the.

between said helical portion of the wire and v the outer casing.

The device thus construct-ed is very convenient in use. Tolieat water ina vessel all that is necessary is to immerse the electric heater in thewater and turn on the electric current. By reason of the comparativelylarge extent of heated and radiating surface, the water is quicklyheated. v I

The construction is such as to reduce to a minimum the liability of thehigh resistance wire burning through on account of the current not beingturned off before the heateris removed @from the water. On account ofthe heater being cup-shaped it will, when withdrawn from the water beingheated, contain a considerable quantity of water, unless it is tilted todischarge the water. This operation of tilting the heater reminds theuser that the electric current must be turned oflflespecially as, whentaken out of water and being tilted, the remaining water within thecup-shaped heater will boil very rapidly, and thus impress upon the userthe necessity of throwingoif the current.

'An electric water heater comprising a cu shaped member having inner andouter a coil of high resistance wire between said casings, suitableinsulation therefor, a tube secured to the in-- ner casing,"andconducting wires extending within said tube and connected to said higresistance wire, substantially as described.

In testimony whereof I have hereunto set I my hand in'lthe presence oftwo subscribing witnesses.

HERBERT A. BURNS. Witnesses:

FRANCIS M. WRIGHT, D. B. RronAnns.

